<template>
  <view>
    <!-- 搜索框 -->
    <my-search @click="jumpSearch"></my-search>
    <view class="scroll-view-container">
      <!-- 左侧栏滚动区域 -->
      <scroll-view class="left-scroll-view" scroll-y="true" :style="{height:wh+'px'}" >
        <template>
          <view :class="['left-scroll-view-item', i===active?'active':'']" v-for="(item,i) in scrollList" :key="i" @click="getChildren(i)">
            {{item.cat_name}}
          </view>
        </template>
      </scroll-view>
      <!-- 右侧子栏滚动区域 -->
      <scroll-view class="right-scroll-view" scroll-y="true" :style="{height:wh+'px'}" :scroll-top="scrollTop">
        <view class="left-scroll-view-item">
          <view class="" v-for="(item1,i1) in childrenList" :key="i1">
            <view class="cate-lv2-title">
               /{{item1.cat_name}}/
            </view>
             <view class="cate-lv3-list">
                <view class="cate-lv3-item"  v-for="(item2,i2) in item1.children" :key="i2" @click="jumpGoodsList(item2.cat_id)">
                  <image :src="item2.cat_icon" mode=""></image>
                  <text>{{item2.cat_name}}</text>
                </view> 
             </view>
          </view>
         
        </view>
      </scroll-view>
    </view>
  </view>
</template>

<script>
  import badgeMix from '@/mixins/tabbar-badge.js'
	export default {
    mixins:[badgeMix],
    data() {
      return {
        // 列表
        scrollList: [],
        childrenList:[],
        // 高度
        wh:0,
        // 默认选中项
        active:0,
        // 滚动条到顶部的距离
        scrollTop:0
      };
    },
    onLoad() {
      const sysInfo = uni.getSystemInfoSync()
      this.wh=sysInfo.windowHeight-50
      this.getScrollList()
    },
    methods: {
      // 获取分类列表
      async getScrollList() {
        const {
          data: res
        } = await uni.$http.get('/categories')
        if (res.meta.status !== 200) return uni.$showMsg()
        this.scrollList = res.message
        this.childrenList = res.message[0].children
      },
     async getChildren(i){
        this.active=i
        this.childrenList = this.scrollList[i].children
        this.scrollTop=this.scrollTop?0:1
      },
      // 跳转页面
      jumpGoodsList(id){
        wx.navigateTo({
          url:'/subpkg/goods_list/goods_list?cid='+id
        })
       },
       // 搜索跳转
       jumpSearch(){
         uni.navigateTo({
           url:'/subpkg/search/search'
         })
       }
    }
  }
</script>

<style lang="scss">
  .scroll-view-container {
    display: flex;

    .left-scroll-view {
      width: 120px;

      .left-scroll-view-item {
        line-height: 60px;
        background-color: #f7f7f7;
        text-align: center;
        font-size: 12px;

        // 激活项的样式
        &.active {
          background-color: #ffffff;
          position: relative;

          // 渲染激活项左侧的红色指示边线
          &::before {
            content: ' ';
            display: block;
            width: 3px;
            height: 30px;
            background-color: #c00000;
            position: absolute;
            left: 0;
            top: 50%;
            transform: translateY(-50%);
          }
        }
      }
    }
  }
  .cate-lv2-title {
    font-size: 12px;
    font-weight: bold;
    text-align: center;
    padding: 15px 0;
  }
  .cate-lv3-list {
    display: flex;
    flex-wrap: wrap;
  
    .cate-lv3-item {
      width: 33.33%;
      margin-bottom: 10px;
      display: flex;
      flex-direction: column;
      align-items: center;
  
      image {
        width: 60px;
        height: 60px;
      }
  
      text {
        font-size: 12px;
      }
    }
  }
</style>
